I would like a series to series relationship to cover series that share a common name and are customised for each country.

This is to cover compilations where the name of the compilation is the same but in each country the track lists are different.
This is mainly to cover compilations by Ministry of Sound such as The Annual where there may be a sub label release the compilation.
http://musicbrainz.org/series/15e868a6-9450-4f37-88d8-b28219eb14a9
http://musicbrainz.org/series/96e82e1d-a9ac-4576-99a9-4b5cd817064f
http://musicbrainz.org/series/d846e9fa-b8a2-4e92-8e02-b5e6eb30ce51
http://musicbrainz.org/series/8790929f-6639-4cf3-95bb-6cad5d0e6609
http://musicbrainz.org/series/e5eedf91-a5b4-43ff-a36a-34e01b93b816